I have never bother to learn gwent but know that I want to I can't because it recons iI don;t have enough unit cards, and it say's I have 20 /22 any help would be great thank you in advance.

Before you try and play. Press H & see if you have more unit cards (Northern Realms) on the left hand side.
These are cards you have, but are not in your deck.
double click on the best ones to move them to the right hand side (your playing deck)
You need 22 to play, if you haven't got 22 Northern Realms cards, buy more.
you can use more than 22 unit cards, but it is usually better to just stick with the best 22.
If your still in White Orchard, the Innkeeper sells cards.


Edit: So if you press the H key, do you have 2 more Northern Realms cards on the left hand side?

Thank you very much for this advise and yes I do have quit a few cards there I can use. Now to try and win some games thank you again.